Abstract
We consider a Hamiltonian system made of weakly coupled anharmonic oscillators arranged on a three dimensional lattice \({\mathbb{Z}}_{2N} \times \mathbb{Z}^2\), and subjected to stochastic forcing mimicking heat baths of temperatures T 1 and T 2 on the hyperplanes at 0 and N. We introduce a truncation of the Hopf equations describing the stationary state of the system which leads to a nonlinear equation for the two-point stationary correlation functions. We prove that these equations have a unique solution which, for N large, is approximately a local equilibrium state satisfying Fourier law that relates the heat current to a local temperature gradient. The temperature exhibits a nonlinear profile.
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Communicated by H. Spohn.
Partially supported by the Academy of Finland.
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Bricmont, J., Kupiainen, A. Towards a Derivation of Fourier’s Law for Coupled Anharmonic Oscillators. Commun. Math. Phys. 274, 555–626 (2007). https://doi.org/10.1007/s00220-007-0284-5
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DOI: https://doi.org/10.1007/s00220-007-0284-5